Im more worried of bots flooding all kinds of social media pushing public oppinion in the direction their owners want. I feel that this is already happening.
I'm pretty sure that LLMs already overpower the average arguing abilities of users on many platforms. Not even low resolution video calls are safe anymore to verify somebody is a real person.
That is true, we must assume nothing is genuine or authentic, video or audio. It used to be photos before, but it is no longer limited to images or photos anymore.